SAUGERTIES, N.Y. (AP) — John Henson, the son of the late Muppets creator Jim Henson, has died in New York. He was 48.

Cheryl Henson says her brother died of a “massive heart attack” at his home in Saugerties on Friday. She says it happened after he had been building an igloo in the snow with his daughter.

Henson followed in his famous father’s footsteps as a puppeteer, performing as Sweetums the ogre in several films, including “Muppet Treasure Island” and “It’s a Very Merry Muppet Christmas Movie.” He was also a shareholder and board member of the Jim Henson Company.

Henson leaves behind his wife Gyongyi (jihn-GEE’) and two daughters, ages 10 and 15. A private funeral service is planned.

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Wadsworth, who often posted articles on environmental and health issues, technology and kittens on social media, was described by loved ones as a wealth of knowledge who constantly blew people away with his intelligence.